Second-Order Sliding Mode Observer for Multiple Kinetic Rates Estimation in Bioprocesses

TitleSecond-Order Sliding Mode Observer for Multiple Kinetic Rates Estimation in Bioprocesses
Publication TypeJournal Article
Year of Publication2013
AuthorsNuñez S, De Battista H, Garelli F, Vignoni A, Picó J
JournalControl Engineering Practice
Volume21
Start Page1259
Issue9
Pagination1259 - 1265
Date Published09/2013
Abstract

Specific kinetic rates are key variables regarding metabolic activity in bioprocesses. They are non-linear functions of concentrations and operating conditions and therefore of difficult access for process control. In this paper, a multiple kinetic rates observer based on second-order sliding mode ideas is proposed. The main difference with other proposals is that smooth estimates are achieved in finite-time without adding additional dynamics. The resulting estimator is robust against uncertainty in the model of the estimated variables. Experimental results from continuous fermentation of S. cerevisiae are presented, where microbial specific growth rate and net ethanol production rate are estimated.